doing dazzle from dota2 and so to avoid buying a ton of body pain i'm using a zentai suit to have that full body coverage but i want to contour the body (chest, arms etc.) somehow and i'm wondering how to go about doing that. paint seems like a good choice at first, but some paints are really hard to get out if you mess up, some are chunky? i guess it the right word... so i'm not sure i wanna take that route...maybe it's unavoidable? but what types of paints?
I appreciate all if any comments, thank you.

Practice, practice, practice. Really the only true answer. Get some fabric similar to the suit you want to paint, get real fabric paints, and try stuff until you get close to what you want.

Check out painting technique videos on you tube if you need help on that end. painting contours will be the same technique whether you are doing body shapes, flowers or animals, so don't skip a free video lesson just because it's a blue haired lady painting flowers.